The ballistocardiogram as a source of haemodynamic information.

@article{Noordergraaf1967TheBA,
  title={The ballistocardiogram as a source of haemodynamic information.},
  author={Abraham Noordergraaf},
  journal={Proceedings of the Royal Society of Medicine},
  year={1967},
  volume={60 12},
  pages={1286-9}
}